Motob



April 16, 1929.

w. MOXLEY 1,709,682

MOTOR FOR WINDSHIELD WIPERS Filed Aug. 5,

I NVEN TOR.

A TTORNELS Patented Apr. 16, 1929. i UNITED l lsil'l llhl l WILLIAM MILLER IVIOXLIEY, OF IiIJkRCELZNE, MISSOURI.

MOTOR FOE YVINDSHIIBLD WIPE MS.

Application filed August 3, 1927. Serial No. 210,310.

This invention relates to automatic windhaust port 27. Consequently, the piston 6 shield wipers, and it has for its object to pro and piston rod 8 will be moved toward the vide an improved and simplified device of right, and in so doing will impart a stroke this character. adapted for use upon the winto the wiper 11. vVhen the pistons have 60 dows of locomotive 'abs, or upon the windnearly reached their limit of movement to shields of motor vehicles, and serving. when ward the right, the right hand end of the in place, to etiiciently clear the glass of rain, piston rod 7 will abut against the stem of the snow, sleet, mist and the like. valve 8", and will move said valve, and the It is one of the important objects of the in exhaust valve, and the piston 1.5 toward the 65 vention to provide a device of the character right. This will unseat the air valve 18, and indicated, which will be simple in its nature, will close the exhaust port 27. The entry of economical to construct, and very reliable in the air to the right hand end of the cylinder operation. will tend to more the pistons toward the left,

In the accompanying drawing, forming and assoon as any pressure accumulates in 70 part of this application, the CylI11(l0 1, Sttl(l pressure will find its way Fig. l is a central longitudinal sectional y the conduit to the left hand end of the diagrammatic i d cylinder l-l, where it will act upon the piston Fig. 2 is a transverse vertical sectional view 15 to move said piston and its associated valve taken on the line of the bearing brackets of toward the righ eby seating the air '7 2 the transverse shaft of the pinion, hercin-- valve 13%,and iuiacaling the exhaust valve 17. after described. i The aiiseating oi the exhaust valve will bring Lik r l d ignat orresponding the left hand end oi the cylinder into comparts i b th f th figures f th d wi g; munication with the atmosphere through ex- Referring to the drawing, 5 designates a haust port 27, andthe result will be that the li d in which two pistons 6 are mounted pistons will travel toward the left, imparting to slide. A piston rod 7 connects the pistons a. stroke to the wiper 11 in the opposite direc 6 d i id d, on on of it id s, with tron. ltis clear that when the pistons reach a rack 8, which meshes with a toothed pinion their limit of movement toward the left, the 9 A arm 10 j t f th i i n 9, and p ston rod 7 will strike the stem of the valve 85 at its extremity has pivotal engagement with 18, and restore it to the position illustrated a wiper 11, adapted to be moved back and in Fig. .1, thereby admitting pressure fluid to :torth over the face of the glass to be cleared, the le'lt hand end of the cylinder. This pres as the pistons 6 reciprocate in the cylinder 5. sure fluid will find its way by conduit 24, to The cylinder heads 1212 carry valve ms the right hand end of cylinder 1 1, moving 90 jug 13 131L, These, casings comprise cylinpiston 15 to the lOlit, to seat air valve 181 and ders 1t14 in which pistons 15-15 are unseat exhaust alve 17. l t d R d 16 16 which are carried by The pinion 9 is mounted upon a trans said pistons constitute the stems of exhaust verse shaft 9, that is supported upon invalves 1717, and air control valves 1818. wardly projecting brackets 28, and the ends 95 A main air supply line 19, having a control of this shaftprojectto the exterior of the valve 20, in its length, connects through cylinder, and one end of the shaft is preferbranches 21 and 22, with ports 2323 of the ably provided with a crank 29, by which an respective valve casings. A conduit 24.- coninitial movement may be imparted to the nects at its left hand end with the left hand mechanism, manually, if the mechanism 100 end of the cylinder 5, and at its right hand should become stuck for any reason, as, for end with the cylinder 1%. A conduit 25 conexample, when it has not been used for some nects, at its left hand end, with the cylinder time.

11 and at its right hand end with the right By providing two pistons, and by disposhand end of the cylinder 5. ing the rack and pinion between these two 105 With the parts in the position illustrated pistons, l avoid the necessity of packing pisin the drawing, air is being admitted through ton rods or of providing a fluid tight joint conduits 19 and 21 to the left hand end of the about the part where the arm 10 passes from cylinder, the air valve 18 being unseated and the interior of the cylinder to the exterior air valve 18 being closed. At this time the thereof. 110

right hand end of the cylinder is in communi- The mechanism herein shown and decation with the atmosphere through an exscribed is of extreme simplicity, may be to be uniiieistood i int the invention L i' e1 7 4, u i 14". .t (L 10*.) iimiiea so the pies se Loiniuc iioii seau des Tiii'iliil iis pur- 1" come either forth, but iihui- View Whatever I] i 1:. x i ()1. the ppeiie d i i i on which in;

siiie eh each iihei'ein, piszin d uiezt direction uiithe eviei' fluid sand inch M the 1 mote end of the e yhii iei', said Valves hein disposed il the line of travel of the pistons and being iiigei i ie be contacted with, and moved oi'itwzu'diy by the direct action of said pistons, and exhuus't poi-cs CODiiOiiCd h said exhaust valves, and serving when uncwweied h said valves to estahi'sh coininuniczition between the interior of the cyie and the stun sphere, said coi'lduit servwhen air oressuie is criuted in the remote end of the cylinder to co'iidiiict such air pressure to the valve casing- Where it acts. upon the valve piston to shift the same to close the air vaive and open the exhaust vaive.

3. A device of the Ciiitlizfifil' described, :ouiprisingi u cyiiudei. 11 pair of pistons x1e e a rack hulbetween said pistons a ainioii with which saie rack him. meshes, a :snsveise shai't'by which sziid pinion is caried, which shaftjlOfBCtS to the exterior of the cylinder, a pressure fluid supply line, a valve at each end of the cylinder for controiiiu g' the fluid pressure thereto, end for controlling the exhaust fluid therefrom, mes-es for shiftin 1;: said valves out'ui'd y under the direct action of: the pistons at their respective limits ofti'zwci, and for shifting said valves in the other diij'ection, under-the :xci'iou oi the fluid pressure taken @0111 the end of the cylinder remote from the valve being moved. i

In testimony whereof I afliz; my signature.

WILLIAM MILLER MOXIJEY. 

